Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eeccc63ddc4f2f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 10:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: f1ca592ca43357c8dbb34722d77e4f6c SHA-1: 3142eda9ce27cc55ad41c099555ea7e833055ac2 SHA-256: 28eeccc63ddc4f2fe47b7bc4893be334bbe7c2eb1d029dbc66fa1028a86c8f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://partnercable.com/files/jezoginidolajozilevomow.pdf In PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/didabijexelirovusuzos.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/69840034594.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613932e2c6583---putavulozibaxi.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/9654329029.pdfIn PDF document text
    • http://samtekelektrik.com/files/madutuz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161356f007cc21---53933339177.pdfIn PDF document text
    • http://plncse.hu/php_data/file/maxutizu.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/11420373041.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kazuzaximiveteripekujilad.pdfIn PDF document text
    • http://www.milestonesmn.org/ckfinder/userfiles/files/memitabijofuxidaxovigewi.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/fuzeperaruxen.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/26989090742.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2t336ofvqignku9j9au9755b27/wafinese.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/41577068250.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/97569846442.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210903140152.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/sirepofimarule.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210908_D22BF21E173FFB36.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22621984782.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/83977739776.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/40099269174.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/33963802177.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/tofovijibozemazevozurevu.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/2341644317.pdfIn PDF document text
    • http://byecook.com/ckupload/files/43395521722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+room+three+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 18688 bytes
SHA-256: e5888a573a12cdc7aae977421c79d9e8da22d4096fc630c51d60b08ebe7cb9db
font_01_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 10540 bytes
SHA-256: 8216cd41e522ba6de41d1998417d8d197e00ca6d7cae84dd21dd59879e72be4a